Multiply by 25 Instantly

Problem

Multiplying by 25 requires complex long multiplication.

Solution

Divide by 4 and multiply by 100 (or multiply by 100 and divide by 4).

Benefit

Converts multiplication into simple division by 4.

Example

32 × 25:
32 ÷ 4 = 8
8 × 100 = 800

48 × 25:
48 ÷ 4 = 12
12 × 100 = 1200